As I was organizing my art, taking many out of their frames so that I'd have more room and less art clutter.
I arranged all my art according to medium and size, put them in acid-free folders and filed them into storage bins according to the sizes...sure is a good feeling to pack down in size.
I did this quick painting a few years back and had forgotten all about it...I went to the Rotary Garden in town and painted Plein Air. I had a piece of cardboard and didn't want to throw it away because it looked good to paint on.
Oddly enough, many Masters painted on cardboard and the paintings lasted to this day...so much for acid-free.